Dong Junping, Ren Linxiao, Zhang Yuan, Cui Xiaoli, Hu Pengfei, Xu Jiaqiang
Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China; State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.
Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China.
Talanta. 2015 Jan;132:719-26. doi: 10.1016/j.talanta.2014.10.027. Epub 2014 Oct 22.
Vertically aligned cable-like CuO@Cu nanowires array was synthesized using a template-directed electrodeposition strategy. The morphology, crystal structure, and surface property of nanowires array were investigated by SEM, HRTEM, XRD, and XPS, respectively. It is found that the free standing namowires are highly dense, and possess about 20 μm in length and 200 nm in diameter. The bulk Cu nanowires are assembled by a number of single crystalline Cu nanoparticles and surface is wrapped by a thin layer of amorphous CuO with size of 2.5 nm. Electrocatalytic activity of the nanowires array towards glucose oxidation was investigated by cyclic voltammetry and amperometry in alkaline media. The nanowires array with 3×3 mm(2) was then used to fabricate a non-enzymatic glucose sensor. The sensor exhibits a wide concentration range of 1×10(-6)M-1×10(-2) M for glucose, with an ultra-high sensitivity of 1250.8 μA mM(-1) cm(-2) and excellent anti-interference ability. The good sensing performances could be attributed to the integration of the superior electrocatalysis of high density of Cu nanowires array and the outer shell of negatively charged CuO against interferences.
采用模板导向电沉积策略合成了垂直排列的线状CuO@Cu纳米线阵列。分别利用扫描电子显微镜（SEM）、高分辨透射电子显微镜（HRTEM）、X射线衍射仪（XRD）和X射线光电子能谱仪（XPS）对纳米线阵列的形貌、晶体结构和表面性质进行了研究。结果发现，独立的纳米线高度密集，长度约为20μm，直径为200nm。块状Cu纳米线由许多单晶Cu纳米颗粒组装而成，其表面包裹着一层厚度为2.5nm的非晶态CuO。在碱性介质中，通过循环伏安法和安培法研究了纳米线阵列对葡萄糖氧化的电催化活性。然后，将尺寸为3×3 mm(2)的纳米线阵列用于制备非酶葡萄糖传感器。该传感器对葡萄糖的浓度检测范围宽，为1×10(-6)M-1×10(-2) M，具有1250.8 μA mM(-1) cm(-2)的超高灵敏度和优异的抗干扰能力。良好的传感性能可归因于高密度Cu纳米线阵列的优异电催化性能与带负电荷的CuO外壳对干扰的抵抗作用的结合。
